JP2010062822A - Electrode pair and electric field communication system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable a user to touch either of a first electrode and a second electrode that an electrode pair have, in electrodes connected to a transceiver for transmitting and receiving information via an electric field transmission medium. <P>SOLUTION: The electrode pair 5, connected to the transceiver which makes the electric field transmission medium induce an electric field based upon the information to be transmitted and detects the induced electric field to transmit and receive the information, comprises the first electrode 51 and second electrode 53. The first electrode 51 and second electrode 53 are disposed crossing each other, and both are disposed on a surface that the user can touch. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an electrode pair and an electric field communication system connected to a transceiver that induces an electric field based on information to be transmitted in an electric field transmission medium and detects the induced electric field to transmit and receive information.

  Although wearable computers are attracting attention due to the miniaturization and high performance of portable terminals, FIG. 14 shows an example in which such wearable computers are worn and used by humans. As shown in the figure, the wearable computer 7 is mounted on a person's arm, shoulder, torso, etc. via a transceiver 9 to transmit / receive data to / from each other, and is provided on the wall or floor so that it can be touched by the tip of a limb. Communication is performed with a personal computer (PC) 8 provided outside through the transceivers 9a and 9b and the cables.

Here, the transceiver 9 used for data communication between the wearable computer 7 and between the wearable computer 7 and the personal computer 8 uses an electric field signal detection technique, and generates an electric field based on information to be transmitted. It is induced in a living body as a transmission medium, and information is transmitted and received using the induced electric field. The transceiver 9 is described in Patent Document 1 and Patent Document 2.
JP 2001-352298 A JP 2006-081111 A

  When the user wearing the mobile terminal as described above contacts an electrode provided on the floor or the like, the mobile terminal and the computer communicate with each other via a transceiver connected to the electrode. Here, the electrodes of the transceivers 9a and 9b provided on the wall or floor so as to be touched by the tips of the limbs are provided with two electrodes, and only one of the electrodes is disposed on the side that can be contacted by the user. Therefore, when the user contacts the other electrode, it is necessary to separately provide an electrode arranged on the side where the other electrode can be contacted by the user, and to newly provide a transceiver connected to the electrode. is there.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an electrode pair connected to a transceiver that transmits and receives information via an electric field transmission medium. The purpose is to enable contact with both the first electrode and the second electrode.

  To achieve the above object, the present invention provides an electrode pair connected to a transceiver for inducing an electric field based on information to be transmitted in an electric field transmission medium and detecting the induced electric field to transmit and receive information. It consists of a first electrode and a second electrode, the first electrode and the second electrode are arranged so as to cross each other, and both the first electrode and the second electrode can be contacted by the user Placed on the surface.

  The present invention also provides an electric field communication system using electric field communication in which an electric field based on information to be transmitted is induced in the electric field transmission medium and the induced electric field is detected to transmit / receive information. A portable terminal carried by a certain user, a computer, and a first transceiver connected to the computer for electric field communication, and the electrode pair connected to the first transceiver includes a first electrode and a first electrode The first electrode and the second electrode are arranged so as to cross each other, and both the first electrode and the second electrode are arranged on a surface that can be contacted by a user, Has a second transceiver for performing electric field communication, and a transmission means for transmitting a predetermined signal when the user is in contact with the first electrode or the second electrode of the first transceiver. , The computer obtains the polarity of the received signal received from the mobile terminal from the first transceiver when the user is in contact with the first electrode or the second electrode of the first transceiver; Processing means for performing predetermined processing according to the polarity of the acquired reception signal.

  According to the present invention, in an electrode pair connected to a transceiver that transmits and receives information via an electric field transmission medium, a user contacts either the first electrode or the second electrode of the electrode pair. It is possible to detect which electrode is touched.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is an explanatory diagram for explaining an embodiment of the present invention. The user wears the portable terminal 1 including the computer 11 and the transceiver 12 and touches the electrode 5 installed on the floor or the like. When the user contacts the electrode 5, a communication path is established between the transceiver 12, the user's human body, the electrode 5, and the transceiver 2. Communication is possible between the computer 11 of the mobile terminal 1 and the computer 3 via this communication path. For example, authentication information such as a user ID is transmitted from the computer 11 of the mobile terminal 1 to the computer 3. May perform user authentication and security checks.

  The illustrated electrode 5 has a pair of symmetrical S + electrode 51 (first electrode) and S− electrode 53 (second electrode) which are symmetrical. An insulating film 54 is disposed between the S + electrode 51 and the S− electrode 53.

  The transceiver 2 uses an electric field signal detection technique, induces an electric field based on information to be transmitted in an electric field transmission medium, and transmits and receives information using the induced electric field. For example, the transceiver 2 has the configuration shown in FIG. 2. When transmission data from the computer 3 is received via the input / output (I / O) circuit 901, the transmission data is received via the transmission unit 902 and the electrode 5. (S + electrode 51 and S− electrode 53), an electric field is induced in the electric field transmission medium via the electrode 5, and this electric field is transmitted to other parts of the electric field transmission medium. The transceiver 2 detects the electric field transmitted by being induced in the electric field transmission medium by the electrode 5, and couples the electric field to the electric field detection unit 905 to convert it into an electric signal. This electric signal is subjected to signal processing such as amplification and noise removal by the signal processing circuit 906, further subjected to waveform shaping by the waveform shaping circuit 907, and output to the computer 3 via the input / output circuit 901. ing.

  The transceiver 2 may be a transceiver configured as shown in FIG. The transceiver 2 illustrated in FIG. 3 includes a transmission unit 802 for transmitting data, a reception unit 803 for receiving data, and an I / O circuit 901. When the transceiver 2 receives transmission data from the computer 3 via the input / output (I / O) circuit 901, the transceiver 2 supplies the transmission data to the electrode 5 via the transmission unit 802, and transmits electric field via the electrode 5. An electric field is induced in the medium, and this electric field is transmitted to other parts of the electric field transmission medium. The transmission unit 802 includes a modulation circuit 804 for modulating transmission data with a carrier wave output from the oscillator 805 and an oscillator 805 for outputting a carrier wave.

  The transceiver 2 detects the electric field induced and transmitted by the electric field transmission medium by the electrode 5, converts the electric field into reception data by the receiving unit 803, and outputs the received data to the computer 3 through the input / output circuit 901. . Based on the received signal and the correction circuit 806 for determining and correcting whether the H and L levels of the demodulated signal have been inverted, and the carrier wave reproduced by the carrier wave reproduction circuit 808. A demodulating circuit 807 for reproducing data and a carrier wave reproducing circuit 808 for extracting a carrier wave from the received signal are provided. It is assumed that the computer 3 outputs a transmission / reception switching signal for instructing switching between transmission and reception operations to the transceiver 2 together with transmission data.

  As illustrated in FIG. 1, the mobile terminal 1 includes a computer 11 and a transceiver 12. The transceiver 12 is the same as the transceiver 2 described above, and includes an S + electrode 51 and an S− electrode 53. In the mobile terminal 1, as shown in the side view of FIG. 1, only one of the S + electrode 51 or the S− electrode 53 is disposed so as to contact the user's body. That is, the user may wear the portable terminal 1 with the S + electrode 51 side in contact with the body, or may wear the portable terminal 1 with the S-electrode 53 side in contact with the body.

  FIG. 4 is an explanatory diagram for explaining the polarity of the transmission signal and the polarity of the reception signal.

  FIG. 4A shows an S + electrode 51 and an S− electrode 53, a differential amplifier circuit 21 that is a part of the transceiver 2 connected to the electrodes 51 and 53, and a polarity determination circuit 22. is there.

  The differential amplifier circuit 21 is a circuit that amplifies a potential difference between signals applied to the electrodes 51 and 53 and outputs the amplified signal as a received signal. In-phase noise (noise applied with equal intensity) mixed in the electrodes 51 and 53 is canceled out by the differential amplifier circuit 21 and removed.

  The polarity determination circuit 22 is a circuit that determines the polarity (positive or negative) of the reception signal output from the differential amplifier circuit 21. For example, the polarity determination circuit 22 presets and stores two threshold values (a positive threshold value and a negative threshold value), and the received signal output from the differential amplifier circuit 21 exceeds either the positive threshold value or the negative threshold value first. And the determination result signal of the polarity of the received signal is output to the computer 3 via the input / output circuit 901. In addition, the polarity determination circuit 22 outputs the received signal to the electric field detection unit 905 (or the demodulation circuit 807 and the carrier wave recovery circuit 808).

  Note that the differential amplifier circuit 21 and the polarity determination circuit 22 are not shown in FIGS. 2 and 3, but are provided in the receiving units 910 and 803.

  FIG. 4B shows the polarity of the signal. When the mobile terminal 1 is mounted in a state where the user is in contact with the S + electrode of the transceiver 12 of the mobile terminal 1, the polarity (rising edge) of the transmission signal 201 transmitted by the computer 11 of the mobile terminal 1 is as illustrated. It is a positive electrode.

  In this case, when the user is in contact with the S + electrode 51 as shown in FIG. 1, the polarity 202 of the reception signal output from the differential amplifier circuit 21 of the transceiver 2 is the same positive electrode as the polarity 201 of the transmission signal. In this case, the polarity determination circuit 22 detects that the received signal first exceeds the positive threshold, and determines that the polarity of the received signal is positive. On the other hand, when the arrangement of the S + electrode 51 and the S− electrode 53 of the electrode 5 shown in FIG. 1 is reversed so that the S− electrode 53 is in contact with the user, the reception that the differential amplifier circuit 21 of the transceiver 2 outputs is received. The polarity of the signal 203 is a negative polarity that is opposite (inverted) to the polarity 201 of the transmission signal. In this case, the polarity determination circuit 22 detects that the received signal is initially below the negative threshold, and determines that the polarity of the received signal is negative.

  Using such a change in the polarity of the received signal, it is possible to determine whether the user is in contact with the S + electrode 51 or the S− electrode 53.

  Next, the structure of the electrode 5 of this embodiment connected to the transceiver 2 will be described.

  FIG. 5 shows a first specific example of the S + electrode 51 and the S− electrode 53. FIG. 5A is a top view of the electrode 5, and FIG. 5B is a diagram of the electrode 5 corresponding to the AA ′ portion, the BB ′ portion, and the CC ′ portion of FIG. It is sectional drawing.

  The illustrated electrodes 51 and 53 are formed using a plate-like conductive material (for example, a copper plate or the like), and at the electrode intersection 55, the S + electrode 51 and the S− electrode 53 are arranged so as to cross each other up and down. The S + electrode 51 and the S− electrode 53 are symmetrical. That is, on the left side (S + surface) in the figure, the S + electrode 51 is disposed on the front surface (side on which the user contacts), and the S− electrode 53 is disposed on the back surface (side on which the user does not contact). On the other hand, on the right side (S-plane) in the figure, the S-electrode 53 is disposed on the front surface (side on which the user contacts), and the S + electrode 51 is disposed on the back surface (side on which the user does not contact). The S + electrode 51 and the S− electrode 53 are covered with an insulating film 54.

  Thus, by arranging the S + electrode 51 and the S− electrode 53 so as to cross each other, for example, when the user moves from the S + plane to the S− plane, the user can move both the S + electrode 51 and the S− electrode 53. Can be in contact with other electrodes.

  FIG. 6 shows a second specific example of the S + electrode 51 and the S− electrode 53. 6A is a top view of the electrode 5, and FIG. 6B is a diagram of the electrode 5 corresponding to the AA ′ part, the BB ′ part, and the CC ′ part of FIG. 6A. It is sectional drawing.

  The illustrated electrodes 51 and 53 are formed using a net-like conductive material (for example, a wire mesh of a copper wire). At the electrode intersection 55, the S + electrode 51 and the S− electrode 53 cross each other up and down. The S + electrode 51 and the S− electrode 53 are symmetrical. That is, on the left side (S + surface) in the figure, the S + electrode 51 is disposed on the front surface, and the S− electrode 53 is disposed on the back surface. On the other hand, on the right side (S-plane) in the figure, the S-electrode 53 is disposed on the front surface, and the S + electrode 51 is disposed on the rear surface. The S + electrode 51 and the S− electrode 53 are covered with an insulating film 54.

  Thus, by arranging the S + electrode 51 and the S− electrode 53 so as to cross each other vertically, the user can contact both the S + electrode 51 and the S− electrode 53. Also, by using a net-like conductive material, the total area of each electrode 51, 53 is reduced, the capacitance between the S + electrode 51 and the S-electrode 53 is lowered to weaken the coupling between the electrodes, The received signal can be prevented from flowing out to the other electrode. Thereby, the thickness of the whole electrode 5 can be made thinner.

  FIG. 7 shows a third specific example of the S + electrode 51 and the S− electrode 53. 7A is a top view of the electrode 5, and FIG. 7B is a cross-sectional view of the electrode 5 corresponding to the A-A 'and B-B' portions of FIG. 7A.

  The illustrated electrodes 51 and 53 are formed by bending a linear conductive material (for example, copper wire) into a wave shape, and at the electrode intersection 55, the S + electrode 51 and the S− electrode 53 cross each other up and down and are replaced. The S + electrode 51 and the S− electrode 53 are symmetrical. That is, they are arranged in the same manner as in FIGS. Thus, by arranging the S + electrode 51 and the S− electrode 53 so as to cross each other vertically, the user can contact both the S + electrode 51 and the S− electrode 53. Further, by using a linear conductive material, the total area of each of the electrodes 51 and 53 is further reduced, the capacitance between the S + electrode 51 and the S− electrode 53 is lowered to weaken the coupling between the electrodes, The signal received by the electrode can be prevented from flowing out to the other electrode, and the thickness of the entire electrode 5 can be further reduced.

  The S + electrode 51 and the S− electrode 53 of the transceiver 12 of the portable terminal 1 are different from those shown in FIGS. 5 to 7, so that only one of the S + electrode or the S− electrode contacts the user's body as shown in FIG. 1. Are arranged.

  Next, an application example of the electric field communication system using the electrode 5 in which the S + electrode 51 and the S− electrode 53 are crossed will be described.

<Application example 1>
FIG. 8 is a configuration diagram of the electric field communication system (entrance / exit management system) of Application Example 1. In the electric field communication system, an electrode 5 that intersects an S + electrode 51 and an S− electrode 53 is installed on a door 81. In the illustrated example, in the upper part of the electrode 5, the S + electrode 51 is disposed on the front surface (side on which the user contacts), and the S− electrode 53 is disposed on the back surface (door side). Then, the S + electrode 51 and the S− electrode 53 intersect at the electrode intersecting portion 55, and the S− electrode 53 is disposed on the front surface and the S + electrode 51 is disposed on the back surface below the electrode 5.

  When the user opens the door 81, the user inputs a password pattern for opening the door 81 by contacting the S + electrode 51 and the S− electrode 53 in a predetermined pattern (predetermined order and predetermined number of times). That is, the user wears the portable terminal 1 so that the S + electrode of the transceiver 12 of the portable terminal 1 contacts the body, and the computer 11 of the portable terminal 1 constantly transmits a predetermined transmission signal (positive signal). It shall be. In this state, when the user touches the S + 51 electrode, a positive signal (plus code: +) is input as a received signal to the transceiver 2 through the user's human body as shown in FIG. When touched, a negative signal (minus code:-) is input to the transceiver 2 as a received signal.

  For example, when the user touches the electrode 5 in the order of “S + electrode, S + electrode, S− electrode, S + electrode, S− electrode, S− electrode”, a plurality of receptions output from the differential amplifier circuit 21 of the transceiver 2 The signal polarity is an input pattern of “+, +, −, +, −, −”. The polarity determination circuit 22 of the transceiver 2 determines the polarity of each reception signal output from the differential amplifier circuit 21 and transmits the polarity input pattern (polarity determination result signal) to the computer 3 via the input / output circuit 901. To do. In addition, the polarity determination circuit 22 transmits a reception signal to the computer 3 via the reception units 910 and 803 and the like.

  The computer 3 (acquisition means, processing means) stores the password pattern in the storage unit in advance, authenticates whether the password pattern and the input pattern transmitted from the transceiver 2 match, and if they match, the door To unlock. If they do not match, keep the door locked.

  When the user wears the portable terminal 1 so that the S-electrode of the transceiver 12 of the portable terminal 1 is in contact with the body, the transmission signal of the computer 11 of the portable terminal 1 is reversed / inverted, and the negative signal Is sent. At this time, when the user touches the electrode 5 in the order of “S + electrode, S + electrode, S− electrode, S + electrode, S− electrode, S− electrode”, a plurality of differential amplifier circuits 21 of the transceiver 2 output The polarity of the received signal is an input pattern of “−, −, +, −, +, +”. That is, the input pattern is an input pattern in which + and − of the input pattern are inverted.

  Therefore, the computer 3 stores two patterns as the password pattern in the storage unit, and the user wears the portable terminal 1 so that either the S + electrode or the S− electrode of the transceiver 12 of the portable terminal 1 is in contact with the computer 3. , Allowing verification and unlocking.

  FIG. 9 shows an example of a transmission signal transmitted by the mobile terminal 1 and a reception signal received by the transceiver 2. Assume that the mobile terminal 1 transmits a user ID “1011” as a transmission signal, and this transmission signal is transmitted by a carrier wave (amplitude shift keying: ASK) shown in FIG. The portion where the carrier wave exists means “1”, and the portion where the carrier wave does not exist means “0”. The illustrated transmission signal is a positive signal, and this transmission signal is input to the transceiver 2 every time the user touches the S + electrode 51 or the S− electrode 52 of the door 81.

  The reception signal of the transceiver 2 when the user touches the S + electrode 51 is a positive signal whose rising edge is positive as shown in FIG. 9B. Further, the received signal of the transceiver 2 when the user touches the S-electrode 53 is a negative signal whose rising edge is negative as shown in FIG. 9C.

  The computer 3 stores a plurality of user IDs permitting unlocking of the door 81 (that is, entry / exit) in the storage unit in advance, and the above-described password pattern matches the input pattern transmitted from the transceiver 2. Further, when the received user ID matches any user ID stored in the storage unit, the door may be unlocked. In this way, when a user ID is transmitted as a transmission signal, not only authentication using an input / password pattern based on the polarity of the signal but also authentication using a user ID can be performed, thereby realizing higher security. it can.

<Application example 2>
FIG. 10 is a configuration diagram of an electric field communication system (movement detection system) of Application Example 2. In the electric field communication system, an electrode 5 in which an S + electrode 51 and an S− electrode 53 are crossed is installed on the floor. In the illustrated example, S + electrodes 51 and S− electrodes 53 are alternately arranged on the surface (upper part) of the electrode 5 in contact with the user. In FIG. 10, since the structure of the electrode 5 is simplified, the electrode crossing portion is not shown, but the S + electrode 51 and the S− electrode 53 are mutually connected as described in FIGS. It is arranged crossing.

  When the user moves from the S + electrode 51 to the S− electrode 53 or from the S− electrode 53 to the S + electrode 51 on such an electrode 5, the polarity of the reception signal of the transceiver 2 is changed from the positive electrode to the negative electrode or from the negative electrode. Invert to the positive electrode. The computer 3 (acquiring means, processing means) can detect that the user has moved based on the change in the polarity of the received signal detected by the transceiver 2.

  Further, as shown in the figure, even when there are a plurality of portions where the S + electrode 51 is on the surface and there are a plurality of portions where the S− electrode 53 is on the surface, the S + electrode 51 and the S− electrode Each of the electrodes 53 is one electrode, and the S + electrode 51 and the S− electrode 53 are alternately exchanged, so that one transceiver 2 can handle them.

  FIG. 11 shows a specific example of the arrangement of the electrodes 5 shown in FIG. FIG. 11A shows an example in which the S + electrodes 51 and the S− electrodes 53 are alternately arranged in a strip shape, and FIG. 11B shows the S + electrodes 51 and the S− electrodes 53 alternately in an array shape. This is an example of arrangement.

<Application example 3>
FIG. 12 is a configuration diagram of the electric field communication system (entrance / exit management system) of the application example 3. The electric field communication system detects whether the user carrying the mobile terminal 1 is outside the door (door) or inside the door.

  The electric field communication system shown in the figure includes a moving direction detection electrode 5A installed on the floor with the S + electrode 51 and the S− electrode 53 intersecting each other across a door, and a transceiver 2A connected to the moving direction detection electrode 5A. The first reference detection electrode 5B, the second reference detection electrode 5C, the reference detection transceiver 2B connected to the first reference detection electrode 5B and the second reference detection electrode 5C, and the transceiver 2A and a computer 3 (acquisition means, processing means) connected to the reference detection transceiver 2B.

  In the illustrated moving direction detection electrode 5A, the S + electrode 51 is disposed on the front surface (side on which the user is in contact) and the S− electrode 53 is disposed on the back surface (on the side where the user is not in contact). The S + electrode 51 and the S− electrode 53 intersect at an electrode intersection 55 below the door, and the S− electrode 53 is disposed on the front surface and the S + electrode 51 is disposed on the back surface in the room.

  The first reference detection electrode 5B is installed in front of the outdoor movement direction detection electrode 5A, and a user who moves outside the room toward the door comes into contact with the movement direction detection electrode 5A (movement direction detection electrode 5A). Before standing on 5A), the first reference detection electrode 5B must be contacted. The second reference detection electrode 5C is installed in front of the indoor movement direction detection electrode 5A, and a user who moves in the room toward the door must make sure that the user does not touch the movement direction detection electrode 5A. It shall be in contact with the second reference detection electrode 5C.

  The first reference detection electrode 5B and the second reference detection electrode 5C are configured such that the S + electrode of the user's portable terminal 1 (transceiver 12) is in contact with the user, or the S− electrode is in contact with the user. It is for discriminating whether it exists. That is, the reception signal (reception signal B) detected by the reference detection transceiver 2B is a positive reception signal when the S + electrode of the mobile terminal 1 is in contact with the user, and the S− electrode is in contact with the user. If it is, it is a negative reception signal. The reference detection transceiver 2B determines the polarity of the received signal and sends the determination result (positive or negative) to the computer 3.

  Then, it is assumed that the user contacts the moving direction detection electrode 5A (S + electrode is the surface) outside the room. At this time, the reception signal (reception signal A) detected by the transceiver 2A is a positive reception signal when the S + electrode of the mobile terminal 1 is in contact with the user, and the S− electrode is in contact with the user. Is a negative reception signal. On the other hand, it is assumed that the user contacts the moving direction detection electrode 5A (S-electrode is the surface) in the room. At this time, the reception signal (reception signal A) detected by the transceiver 2A is a negative reception signal when the S + electrode of the portable terminal 1 is in contact with the user, and the S− electrode is in contact with the user. Is a positive reception signal. The transceiver 2A determines the polarity of the received signal and sends the polarity determination result (positive or negative) to the computer 3 via the input / output circuit 901.

  On the basis of the polarity determination result (polarity determination signal B) transmitted from the reference detection transceiver 2B and the polarity determination result (polarity determination signal A) transmitted from the transceiver 2A, the computer 3 Whether the user is in the room or in the room.

  For example, when the user touches (steps on) the first reference detection electrode 5B or the second reference detection electrode 5C, if the reception signal (reception signal B) of the reference detection transceiver 2B is positive, The computer 3 determines that the S + electrode of the mobile terminal 1 is in contact with the user. If the received signal (received signal A) of the transceiver 2A is positive when the user touches the moving direction detection electrode 5A, the computer 3 detects that the outdoor direction of movement is detected as shown in FIG. It is determined that the user is on the electrode 5A. Conversely, if the reception signal (reception signal A) of the transceiver 2A is negative at this time, the computer 3 determines that the user is on the indoor movement direction detection electrode 5A.

  On the other hand, when the user contacts the first reference detection electrode 5B or the second reference detection electrode 5C, if the reception signal (reception signal B) of the reference detection transceiver 2B is negative, the computer 3 It is determined that the S-electrode of the mobile terminal 1 is in contact with the user. If the received signal (received signal A) of the transceiver 2A is negative when the user touches the moving direction detecting electrode 5A, the computer 3 detects the moving direction outside the room as shown in FIG. It is determined that the user is on the electrode 5A. Conversely, if the received signal (received signal A) of the transceiver 2A is positive at this time, the computer 3 determines that the user is on the indoor moving direction detection electrode 5A.

<Application example 4>
FIG. 13 is a configuration diagram of an electric field communication system (authentication system) installed in the cabinet of the application example 4. FIG. 13A is a top view of the cabinet, and FIG. 13B is a perspective view of the cabinet. In this electric field communication system, when a user carrying the portable terminal 1 contacts the electrode 5 installed on the door of the cabinet, the user ID stored in the computer 11 of the portable terminal 1 is changed to the transceiver 12, the human body of the user. And transmitted to the computer 3 via the transceiver 2.

  Then, the computer 3 (acquisition means, processing means) determines whether or not the received user ID is a user ID permitted to use the cabinet (that is, any one of user IDs registered in advance in the storage unit). If the user ID is permitted to be used, the cabinet door that is locked is unlocked.

  In the electrode 5 installed in the cabinet of the present embodiment, the S + electrode 51 is disposed on the front surface and the S− electrode 53 is disposed on the rear surface on the left side of the electrode 5, similarly to the electrode 5 described with reference to FIGS. 5 to 7. . The S + electrode 51 and the S− electrode 53 intersect at an electrode intersection (not shown), and on the right side of the electrode 5, the S− electrode 53 is disposed on the front surface and the S + electrode 51 is disposed on the back surface. The user contacts either the left side of the electrode 5 (S + electrode 51 is the surface) or the right side of the electrode 5 (S− electrode 53 is the surface), and unlocks the cabinet door.

  Here, the user may forget to place the mobile terminal 1 on the cabinet. When the conventional electrode in which the S + electrode 51 and the S− electrode 53 do not intersect (for example, the entire surface is the S + electrode and the entire back surface is the S− electrode), the user ID transmitted from the portable terminal 1 (computer 11) is the transceiver 12 Are transmitted to the computer 3 through the cabinet and the transceiver 2 which are electric field transmission media. Then, the computer 3 authenticates the received user ID and unlocks the locked cabinet door. That is, if the portable terminal 1 is misplaced in a place in contact with the cabinet, the cabinet door remains unlocked.

  On the other hand, even if the portable terminal 1 is left behind on the cabinet where the electrode 5 shown in FIG. 13 is installed, the cabinet door is not unlocked and is locked. It can be improved further. That is, since the user ID signal transmitted from the misplaced mobile terminal 1 is applied with the same strength as the S + electrode 51 and the S− electrode 53, the user ID signal is removed by the differential amplifier circuit 21, and the computer 3 receives the mobile terminal. The user ID sent by 1 does not arrive. Therefore, the cabinet door is not unlocked but is locked. That is, by using a symmetrical electrode in which the S + electrode 51 and the S− electrode 53 are crossed, it is possible to prevent a malfunction of unlocking the cabinet door due to the misplacement of the portable terminal 1.

  In the electrode 5 of the present embodiment described above, the user can contact both the S + electrode 51 and the S− electrode 53 by arranging the S + electrode 51 and the S− electrode 53 so as to cross each other. Further, it can be detected which electrode 51, 53 is touched.

  Further, by using a net-like or linear conductive material for the S + electrode 51 and the S− electrode 53, the total area of each electrode 51, 53 is reduced, and the capacitance between the S + electrode 51 and the S− electrode 53 is reduced. By lowering, the coupling between the electrodes is weakened, whereby the thickness of the entire electrode 5 can be made thinner.

  As mentioned above, although embodiment of this invention has been described, various deformation | transformation and change can be performed with respect to embodiment of this invention in the range which does not deviate from the summary of this invention.

It is explanatory drawing for demonstrating embodiment of this invention. It is a schematic block diagram of a transceiver. It is a schematic block diagram of a transceiver. It is explanatory drawing for demonstrating the polarity of a transmission signal, and the polarity of a received signal. It is a 1st specific example of a S + electrode and a S- electrode. It is the 2nd specific example of S + electrode and S- electrode. It is the 3rd example of S + electrode and S- electrode. It is a block diagram of the electric field communication system of the 1st application example. An example of the transmission signal and reception signal of the first application example is shown. It is a block diagram of the electric field communication system of the 2nd application example. The specific example of arrangement | positioning of the electrode of a 2nd application example is shown. It is a block diagram of the electric field communication system of the 3rd application example. It is a block diagram of the electric field communication system of the 4th application example. It is explanatory drawing which shows the example in the case of mounting | wearing and using a wearable computer for a person via a transceiver.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Portable terminal 11 Computer 12 Transceiver 2 Transceiver 3 Computer 5 Electrode 51 S + Electrode 53 S- Electrode 54 Insulating film 55 Electrode intersection

Claims (6)

An electrode pair connected to a transceiver that induces an electric field based on information to be transmitted in an electric field transmission medium and detects the induced electric field to transmit and receive information,
Consisting of a first electrode and a second electrode,
The first electrode and the second electrode are arranged so as to cross each other, and both the first electrode and the second electrode are arranged on a surface that can be contacted by a user. The electrode pair according to claim 1, wherein
The first electrode and the second electrode are formed using any one of a plate-like conductive material, a net-like conductive material, and a bent linear conductive material. Electrode pair to be used. The electrode pair according to claim 1, wherein
The pair of electrodes, wherein the first electrode and the second electrode are symmetrical pairs. An electric field communication system using electric field communication that induces an electric field based on information to be transmitted in an electric field transmission medium and detects the induced electric field to transmit and receive information,
A portable terminal carried by a user as an electric field transmission medium, a computer, and a first transceiver connected to the computer and performing electric field communication;
The electrode pair connected to the first transceiver includes a first electrode and a second electrode. The first electrode and the second electrode are arranged so as to cross each other, and the first electrode and the second electrode Both electrodes are placed on a user accessible surface,
The portable terminal is
A second transceiver for performing electric field communication;
Transmitting means for transmitting a predetermined signal when the user is in contact with the first electrode or the second electrode of the first transceiver;
The computer
Obtaining means for obtaining, from the first transceiver, the polarity of the received signal received from the mobile terminal when the user is in contact with the first electrode or the second electrode of the first transceiver;
An electric field communication system comprising: processing means for performing predetermined processing according to the polarity of the acquired reception signal. The electric field communication system according to claim 4,
The electrode pair connected to the first transceiver is installed on a door;
The acquisition means of the computer outputs an input pattern indicating the polarities of a plurality of received signals received from the portable terminal when the user contacts the first electrode and the second electrode a plurality of times in a predetermined order. From one transceiver,
The electric field communication system, wherein the processing means determines whether or not the acquired input pattern matches a predetermined registration pattern, and unlocks the door when the input pattern matches. The electric field communication system according to claim 4,
Reference detection transceiver for determining whether the third electrode or the fourth electrode of the second transceiver of the mobile terminal 1 is in contact with the user, and a reference detection electrode connected to the reference detection transceiver And
The acquisition means of the computer acquires the polarity of the received signal received from the portable terminal from the reference detection transceiver when the user is in contact with the reference detection electrode,
The processing means determines whether the third electrode or the fourth electrode of the mobile terminal 1 is in contact with the user based on the polarity of the received signal acquired from the reference detection transceiver. system.

Images